Eclipse L4-1997cc 2.0L DOHC (1991)
Transmission Mount: All Technical Service Bulletins
Interior - Drivetrain Vibration
NO.: TSB-94-32-001
DATE: April, 1994
MODEL: 1990-94 Eclipse
SUBJECT:
DRIVETRAIN VIBRATION
BACKGROUND INFORMATION
On some 1990-94 Eclipses, a drivetrain vibration may be felt between 45-55 mph while driving over a smooth road. This vibration may be caused by the
engine and transaxle mounting bracket assemblies. Since this type of vibration can also be caused by items such as tires, wheels, suspension components,
radiator mounting brackets, or other component mounting brackets, it is important to pinpoint the vibration's source before replacing the engine and
transaxle mounting bracket assemblies.
This bulletin explains how to determine the source of the drivetrain vibration by conducting a check of vehicle components likely to cause vibration. If
the vibration is still present after performing the checking procedure, install new engine and transaxle mounting bracket assemblies using the part
numbers listed.
VEHICLES AFFECTED
1990-94 Eclipse, 2.0L, Turbo, 2WD and AWD, A/T and M/T
1990-94 Eclipse, 2.0L, Non-Turbo, M/T only
DESCRIPTION
To determine the source of drivetrain vibration, perform the checking procedure.
WARNING:
Observe standard shop safety practices while performing the procedure.
NOTE:
Obtain the following materials before performing the procedure:
-
Volume 1 of the 1990, 1991, or 1992-94 Eclipse Service Manual
-
Technical Service Bulletin Number TSB-93-14-002
1.
Check and adjust the tire air pressures. Cold tire specifications are:
Turbo equipped vehicles: 32 psi (front), 29 psi (rear)
Non-Turbo equipped vehicles: 29 psi (front), 26 psi (rear)
2.
Test-drive the vehicle at 45-55 mph (smooth road) to confirm the drivetrain vibration:
WARNING:
When performing this road test, exercise good judgment and obey all road safety laws applicable to your particular State, County, and/or local
government. If you are not familiar with local motor vehicle safety laws, refer to the motor vehicle statutes of your State regarding operation of motor
vehicles on public roads.
On vehicles with M/T, remove your foot from the accelerator pedal and press in the clutch pedal while at test speed.
On vehicles with A/T, remove your foot from the accelerator pedal and move the shift selector from "Drive" to "Neutral" while at test speed.
If the vibration at 45-55 mph continues after the clutch pedal is pressed in or when the A/T is shifted to neutral, go to Step 3; the vibration is
probably not caused by the engine and transaxle mounting brackets.
If the vibration at 45-55 mph goes away after the clutch pedal is pressed in or when the A/T is shifted to neutral, go to Step 7; the vibration may be
caused by the engine and transaxle mounting brackets.
3.
Raise the vehicle on a shop hoist and check each wheel for damage and/or distortion. If necessary, replace the wheel(s). In most instances, wheel
damage is a "customer pay" item. Be sure to obtain customer authorization before replacing the wheel(s).
